Pressure indicator



July 6,1926. 1,591,137

F. w. LUNDY PRESSURE INDICATOR Fi led Jan. 16, 1926,

I'I-IIIH: {4 i 3 g f s lllhlmfll f ied Pa -rented Julyfi, 1925. i I U V 7 it I H i -""remembe -me nine 1 3171926. see No 81,868; Y

e v I o* ices"fo",1ndi the same time'ithat evaporationwages;be; eating the vapor pressure lflilltOifiOlQl "come appreciable. The gauge will ri nd Internal combustion engines are'einpl'oy ed fail ind cating evaporationnntil the pres almost universally foiifiirnishing th' e motive I siire becomes 'su'fiic'ient to m t in thiefindi 60 7: This invention relates t 5 power r01- automohile's andall reqnire some Cami-in' thefraised position-indicating pres cooling means; if ith' onefinotable exception". sure. It'is therefore evident -that i'f'- a pre f the internal comb'ustionengines used-in'co'n sure indicating device'is appli ed 'to th rat 1- nect'ion with" automobiles" are water cbolie'd a'tori itwillserveto indieatethe'pre of and employ an element known as a radiator: steam in any'considerableamount. y I

i- 1;) Under-normal 'conditions'the radiator" keeps It isthe' object or tlilSlIiVQIlDl the cooling liquid below the-evaporation duce pressure responsive-devicewhrc is point. i r H a'daptedto-be attached t d a radiatorand On warm days and when-the" engine" is which will indicate thepressureof steam-in heavily loadedor when for! some reason the any considerable.amount; I y

water does not circulate'proper iy; the radi This' yinve1f1tiorf;*briefly T described ator is insufficient as keep the water cool prisesa tubular membemmvmg and Consequently vapor will be thrownflofi "drical opening whi h; a light piston is inside the radiator and will escape tll'lil an ni ounted sd as to reeiprocatei' Tliis'rlilnbrj' 3 overflow pipe provided for this purpose; isiarranged'in a vertical position'ar'fdhas its V The location o t this overflow pipe on the lower end in eoniinunication with the radiatorof an jautoinobileis such that the terior' of: a marries: The'rpiston-will n escap ing vapor is not visible r in-fling;may"occapy'ihe 1dw'ermost' positien and drivers position. -Vapor escaping in" any will] extend downwardly into the; radiator; considerable amount is very;undesirable as Whenthepress' ire"increases, the piston-will 80: it not only depletes the ineager water supbe 3 moved upwarmy. 'The-tubularimember. ply of the radiator-]out, in wintenwhen al has an" o ening through which; the} piston Cohol or 'other'nonireez'ing soltitionisused; be seen" and the piston" has"-its outer l-ly the trial 85 it wastes'thenon'freeiing agent-male g 'op sure e'e colo-ied red" a1'ifdgreen";= no1m er'ation inu'chmor'e expensive than nece greencolorfis' visible but "when =abnor- Often the'vapor rises fsofrapidlythat 'the, conditionsprevailthe red colored portion is drainpipe becomesinadequate to'icarry'iit visible;

away and the whole cooling system ispu't Hav'ing thus briefly described inven: under a" considerable" pressure: Probably tion, I; will now'proce'ed todescribe'tlre same i many leaks which occur in the odlingsys-"in detail anfd for this'purpose refe'renicewill 0 v tem' could be avO'idediith drivefbut 'knew' be 'hafdto the aocompanyingdrawing"where that the cooling system 'was under pressure; one embodiment of the invention ha s been Many accidents ha vefoc'cu'r e'd-in which pea illustratedandimwhich. x s

son s havebeen more or lessseriously burned Fig:;1-* isa"-side elevatioriof the devie when removing the racliator cap unaware'of looking jforwardly' from =the-' driver 's seat; Q5 4 the pressure inside the radiator. T f Fig. 2 is "a vertical lsectio'n taken-'on 'line In order thatethedriver maybe apprised- 2 2;Fig; l and sliows'the parts'in normal of the pressure conditions within thefrad-v. or, inoperativepositionjk ator; thermometers have been constructed V FigZ-B is a' sectionflike' that sh I fnjin Fig; 'wh i ch projectthrough the radiator caps and Q'hut-withthe -partsfshown iii' operative posi 100 have the-bulb withiir a'nd the stem without tiong I f I j the-cap so that the driver mayatall times Fig, 4 is a vertical section through the tell the actual thermal condition of the coolplunger or piston and 1 ing water. To-arrive at pressure conditions Fig. 5 is a side elevation e of an engine and from known thermal conditions would necesradiator, the latter being shown in section 1 05 sitate considerable calculation inasmuch as and with my improved pressure device in the pressuredoes not vary directly, with the place thereon. V temperature, f v Numeral 11 indicates a'cap adapted to fit' -D ueto the resistance in'the smadljdrain Y the fill opening of a radiator. This cap "pipes providedpn radiators of this: type, maybe constructed in any suitable manner '3 1 0 a sufficient pressure will be hadto raise the inbut has beensho'wn as having an externally dicator'of a pressuregauge, substantially at threaded portion 2, a flange Band a recess 7 V integral, as shown, or piece suitably secured may be secured to the upper'end is provided;

4. The caphas a central openingfiin which a tubular cylindrical member 6' is located;

7 this tubular member terminates a short dis tance below the top of the cap but extends upwardly a considerable distance in the The lower endof the tube'G manner shown; has an lnwardly extending flange 7 and the with a cap 8. which ma ber'constructed as shown or made more or essornamentalr Near the upper end'of member 6' directly below the cap 8, two diametrically opposed openings '9 are provided? so that light can pass entirely through the tube at this.point.. A'short distance; below the opening 9 another opening is provided and this has been designated by numeral 10.

'Within the tubular member dis a plunger 7 or piston ll which may be made of any suitable material such as cork, glass, celluloid or metal. The plunger illustrated has been formed from aluminum and has its lower end closed in the manner indicated by'numeral 12 in Fig. 4. The outside diameter of e the plunger is slightly less than the j inner diameter of the tube 6' and itis provided with a'short ring 13 whose outside diameter 7 is substantially the same as the inner di- I which will prevent ring13 and cap 14 bei'ngcolored ameter' of the tube 6; The ring 13 may be made of a separate thereto. A cap 14 upper end of the plunger for the purpose of preventing water from accumulating in .the plunger. The plunger is inserted into the tube 6 from the top andwillnormally assume a place in which thering 13 rests upon the flange 7.

A washer 15 is secured tothe bottom 12 by;

is evident that the operative position (Figs. 1 and 2) the green color is visible through the opening lO but when the plunger has'been raised to the uppermost position shown in F 3 the red" 7 I coloris visible through the opening 10. At

night itwould be diflicult to distinguish ,the roadway what color is visible throughthe opening 10 and for the purpose of enabling the driver to read the signal at night the holes 9 have been provided. When the plungeris in the position shown in Figs. land 2, light from willpass through these holes but when the shown inFig. 3, V openings '9 will be obstructed which fact can openings. In Fig. '5 I elements of the plunger is in the position the-passageway through the readily be detected by the driver at night becauseno light 'is visible through/these have illustrated the several" combination in which my in vention is to be used; numeral 17 indicatin 18 thewater jacket and'19' the the engine, I

which the pressure 1ndicator is radiator to attached. 7 V 7 r I am aware that temperature responsive means have been employed'in a similar combination but as far as Iam aware, no one has ever employed the Vapor pressure to produceindications that vary with thetemperature and I therefore intend to claim this combination broadly as well as my apparatus specifically. I i

aving now described my invention what I claim as new is: v

The combination with a cap for thefiller V V iatorof ahollow with'an axialcyspout of an automobilerad tubular member provided lind-rical opening mounted on said cap,the lower end of said opening being in communication with the interior ofthe' radiator; a 1

piston slidaloly mounted in said opening, said piston hav ng one end 1n communication with the interiorof the radiator and the x other in communication with the atmos phere, means forlimiting the downwardmovement of'said piston, said means per mitting the piston to move upwardly when sufiicient pressure is appl ed to the lower end? thereof and a combined stop and sealing -H1QEtIISfOI limiting the upward movement 7 v of the piston V and for V preventing the escape'of'vapor, said tubular member having a diametrically opposed openings at a point above theenormal position of the upper end of the piston whereby saidppenin'gs will be positlon.

In testimony obstructed only when the piston is in raised whereo f- I fix my signature.

1 FRED W,."LUVNDY:.:F 

